88 



short processes from llie anterior cn(\ of the body eannol really be rei^arded 

 as aalero-laleral anus, parlly because I lie irrej4ular rods by which Lhey 

 are supported cannot be homologous with the anterolateral rods, partly 

 because they appear not to be bordered by the vibratile band. The post- 



\'ani 



Fig. 34. Skeleton of Echinopluteus transversus, species e. A. seen from behind; B. from llie 

 dorsal side. "°/,. abm. abductor muscle, b. body rod; dam. dorsal adductor muscle; 

 pd. posterodorsal rod; po. posloral rod; ptr. posterior transverse rod; str. supplementary 

 transverse rod; vam. ventral adductor muscle; t. thorn: ♦ rudimentary anterolateral rod. 



oral band makes an elegant curve or rather half circle round the whole 

 anal lobe, and then makes a nearly right angle in passing out along the 

 postoral arms. Along the dorsal side it makes a pair of folds. The preoral 

 band is difficult to observe; it passes close along the posloral band, the 



